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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS
 12 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS
NOTE 13 FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS
We have certain assets and liabilities that are required to be measured and disclosed at fair value. Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. We use the following fair value hierarchy established in ASC 820-10 to measure fair value to prioritize the inputs:
•Level 1 — Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.
•Level 2 — Observable inputs, other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets; quoted prices for similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
•Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.
The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Refer to Note 14—Employee Benefit Plans for details on the fair value hierarchy of our pension plan assets.
Fair Value Measurements
The following tables summarize our financial assets and liabilities measured at fair value on a recurring basis and indicate the level in the fair value hierarchy in which we classify the fair value measurement as of the dates indicated below.
September 30, 2025
(in thousands)Fair Value    Level 1    Level 2    Level 3
Assets
Short-term investments:
Corporate debt securities$21,302 $— $21,302 $— 
Total21,302 — 21,302 — 
Long-term investments:
Recurring fair value measurements:
Equity securities:
Non-qualified supplemental savings plan17,662 17,662 — — 
Investment in Tamboran25,976 25,976 — — 
Other equity securities
1,449 1,449 — — 
Debt securities:
Investment in Galileo, net— — — — 
Geothermal debt securities, net
2,000 — — 2,000 
Other debt securities
250 — — 250 
Total$47,337 $45,087 $— $2,250 
As of September 30, 2025, our short-term security investments in held to maturity bonds totaled $0.2 million. These investments are measured at cost, less any impairments.
As of September 30, 2025, our equity security investments in geothermal energy and other equity security investments were $14.1 million and $6.7 million, respectively. These investments are measured at cost, less any impairments.
September 30, 2024
(in thousands)Fair Value    Level 1    Level 2    Level 3
Assets
Short-term investments:
Corporate debt securities$33,813 $— $33,813 $— 
U.S. government and federal agency securities 53,490 53,490 — — 
Investment in ADNOC Drilling205,616 205,616 — — 
Total292,919 259,106 33,813 — 
Long-term investments:
Recurring fair value measurements:
Equity securities:
Non-qualified supplemental savings plan15,633 15,633 — — 
Investment in Tamboran20,958 20,958 — — 
Debt securities:
Investment in Galileo27,044 — — 27,044 
Geothermal debt securities, net
2,000 — — 2,000 
Other debt securities4,588 4,338 — 250 
Total$70,223 $40,929 $— $29,294 
As of September 30, 2024, our equity security investments in geothermal energy were $25.8 million, of which $0.1 million was measured at fair value as of September 30, 2024. The remaining $25.7 million is measured at cost, less any impairments. Our other equity security investments totaled $4.3 million and our debt security investments in held to maturity bonds totaled $0.3 million. These investments are measured at cost, less any impairment.
Recurring Fair Value Measurements
Short-term Investments
Short-term investments primarily include securities classified as trading securities. Both realized and unrealized gains and losses on trading securities are included in Other income (expense) in the Consolidated Statements of Operations. These securities are recorded at fair value. Level 1 inputs include U.S. agency issued debt securities with active markets and money market funds. For these items, quoted current market prices are readily available. Level 2 inputs include corporate bonds measured using broker quotations that utilize observable market inputs.
During September 2021, the Company made a $100.0 million cornerstone investment in ADNOC Drilling in advance of its announced initial public offering, representing 159.7 million shares of ADNOC Drilling, equivalent to a one percent ownership stake and subject to a three-year lockup period. ADNOC Drilling’s initial public offering was completed on October 3, 2021, and its shares are listed and traded on the Abu Dhabi Securities Exchange. During September 2024, the three-year lockup period expired and the balance was reclassified to Short-term investments on our Consolidated Balance Sheets.
During the fiscal year ended September 30, 2025, we sold our equity securities of 159.7 million shares in ADNOC Drilling and received net proceeds of approximately $193.3 million. During the fiscal year ended September 30, 2025, we recognized a loss of $12.4 million on our Consolidated Statements of Operations, related to this investment, of which $8.4 million is associated with the change in fair value of the investment and $4.0 million relates to transaction fee associated with the sale of the securities. During the fiscal year ended September 30, 2024 and 2023, we recognized a gain of $30.9 million and $27.4 million, respectively, as a result of the change in fair value of the investment. This investment was classified as a Level 1 investment based on the quoted stock price on the Abu Dhabi Securities Exchange, and was measured at fair value with any gains recorded within Gain (loss) on investment securities on our Consolidated Statement of Operations.
Long-term Investments
Equity Securities Our long-term investments include debt and equity securities and assets held in a Non-Qualified Supplemental Savings Plan ("Savings Plan") and are recorded within Investments on our Consolidated Balance Sheets. Our assets that we hold in the Savings Plan are comprised of mutual funds that are measured using Level 1 inputs.
Equity Securities with Fair Value Option In October 2022, we made a $14.1 million equity investment, representing 106.0 million common shares in Tamboran Resources. In December 2023, all shares of Tamboran Resources were transferred to Tamboran Corp. in exchange for depository interests in Tamboran Corp. Depository interests, referred to as CHESS Depository Interests, each representing beneficial interests of 1/200th of a share of Tamboran Corp. common stock, are listed on the Australian Stock Exchange under the ticker symbol "TBN." Tamboran Corp. is focused on developing a natural gas resource in Australia's Beetaloo Sub-basin.
On June 4, 2024, the Company entered into a convertible note agreement with Tamboran Corp. This note was utilized to relieve Tamboran's outstanding accounts receivable balance owed to the Company, and therefore no cash was exchanged as part of the transaction. The convertible note agreement provided that the notes converted into shares of common stock of Tamboran Corp. under certain circumstances in connection with an initial public offering in which its stock was listed on the NYSE or NASDAQ Stock Exchange. On June 26, 2024, Tamboran Corp. completed an initial public offering of its common stock on the NYSE and its common stock is listed on the NYSE, under the ticker "TBN". As a result of this offering, the convertible note of $9.4 million was converted into 0.5 million common shares in Tamboran Corp. Our shares received in this initial public offering were subject to a 180-day lockup period, which expired during the first fiscal quarter of 2025.

As of September 30, 2025, our combined equity ownership was approximately 6.1 percent representing 1.0 million common shares in Tamboran Corp. During the fiscal year ended September 30, 2025, our representation on the investee’s board of directors ceased. As a result, we determined that we no longer have the ability to exert significant influence over the investee. We consider this investment to have a readily determinable fair value and have elected to continue to account for this investment using the fair value option with any changes in fair value recognized through net income. Under the guidance, Topic 820, Fair Value Measurement, this investment is classified as a Level 1 investment based on the quoted stock price which is publicly available. Our investment is classified as a long-term equity investment within Investments on our Consolidated Balance Sheets and measured at fair value with any gains or losses recognized through net income and recorded within Gain (loss) on investment securities on our Consolidated Statements of Operations. During the years ended September 30, 2025, 2024, and 2023 we recognized gains (loss) of $5.0 million, $1.6 million and $(4.2) million, respectively, recorded within Gain (loss) on investment securities on our Consolidated Statements of Operations, as a result of the change in fair value of the investment.
Debt Securities During April 2022, the Company made a $33.0 million cornerstone investment in Galileo Holdco 2 Limited Technologies ("Galileo Holdco 2"), part of the group of companies known as Galileo Technologies (“Galileo”) in the form of notes with an option to convert into common shares of the parent of Galileo Holdco 2. The convertible note bears interest at 5.0 percent per annum with a maturity date of the earlier of April 2027 or an exit event (as defined in the agreement as either an initial public offering or a sale of Galileo). During the fiscal year ended September 30, 2023, our convertible note agreement was amended to include any interest which has accrued but not yet compounded or issued as a note. As a result, we include accrued interest in our total investment balance.
During the fiscal year ended September 30, 2025, our convertible note agreement was amended to extend the maturity date to the earlier of December 2027 or an exit event. The convertible note will continue to bear interest through the extended maturity date. Additionally, during the fiscal year ended September 30, 2025, we recorded a $29.6 million loss on our investment in Galileo, due to an allowance for credit loss on the convertible note, driven by heightened liquidity constraints and changes in governance, which led management to conclude that the fair value of the investment was not recoverable. As a result, the investment was fully reserved as of September 30, 2025. The loss was recognized through net income and recorded within Gain (loss) on investment securities on our Consolidated Statements of Operations.
During the year ended September 30, 2024, we recorded an allowance for credit loss of $10.2 million, as a result of the change in fair value of the investment due to credit related factors. The loss was recognized through net income and recorded within Gain on investment securities on our Consolidated Statements of Operations.
The following table provides quantitative information (in thousands) about our Level 3 unobservable significant inputs related to our debt security investment with Galileo at September 30, 2024:
Fair Value
(in thousands)
Valuation TechniqueUnobservable Inputs
$27,044 Black-Scholes-Merton modelDiscount rate18.7 %
Risk-free rate3.5 %
Equity volatility66.0 %
A majority of our long-term debt securities, including our investment in Galileo, are classified as available-for-sale and are measured using Level 3 unobservable inputs based on the absence of market activity. The following table reconciles changes in the fair value of our Level 3 assets for the periods presented below:
Year Ended
September 30,
(in thousands)2025
2024
Assets at beginning of period$29,294 $37,440 
Purchases— 250 
Accrued interest1,860 1,771 
Total gains or (losses):
Included in earnings(29,287)(10,167)
Included in other comprehensive income (loss)
383 — 
Assets at end of period$2,250 $29,294 
Nonrecurring Fair Value Measurements
We have certain assets that are subject to measurement at fair value on a nonrecurring basis. For these nonfinancial assets, measurement at fair value in periods subsequent to their initial recognition is applicable if they are determined to be impaired. These assets generally include property, plant and equipment, goodwill, intangible assets, and operating lease right-of-use assets. If measured at fair value in the Consolidated Balance Sheets, these would generally be classified within Level 2 or 3 of the fair value hierarchy. Further details on any changes in valuation of these assets is provided in their respective footnotes.
Equity Securities
We also hold various other equity securities without readily determinable fair values, primarily comprised of geothermal investments. These equity securities are initially measured at cost, less any impairments, and will be marked to fair value once observable changes in identical or similar investments from the same issuer occur. All of our long-term equity securities are measured using Level 3 unobservable inputs based on the absence of market activity.
The following table reconciles changes in the balance of our equity securities, without readily determinable fair values, including investments that have been marked to fair value on a nonrecurring basis, for the periods presented below:
Year Ended
September 30,
(in thousands)
2025
2024
Assets at beginning of period$30,090 $28,232 
Purchases2,769 3,870 
Disposals1
(27,117)(616)
Transfer in320 — 
Total gains or (losses):
Included in earnings2
14,799 (1,396)
Assets at end of period$20,861 $30,090 
(1)During the fiscal year ended September 30, 2025, we liquidated one of our geothermal equity investments for $27.1 million.
(2)The gains recorded during the fiscal year ended September 30, 2025 were attributable to the change in fair value of various geothermal equity investments as a result of disposals or observable price changes in identical or similar investments during the periods.
Other Financial Instruments
The carrying amount of cash and cash equivalents and restricted cash approximates fair value due to the short-term nature of these items. The majority of cash equivalents are invested in highly liquid money-market mutual funds invested primarily in direct or indirect obligations of the U.S. Government and in federally insured deposit accounts. The carrying value of accounts receivable, other current and noncurrent assets, accounts payable, accrued liabilities and other liabilities approximated fair value at September 30, 2025 and 2024.
The fair values of the long-term fixed-rate debt are based on broker quotes at September 30, 2025 and 2024. The unsecured senior notes are unsecured term loan agreement are classified within Level 2 of the fair value hierarchy as they are not actively traded in markets.
The following information presents the supplemental fair value information for our long-term fixed-rate debt at September 30, 2025 and 2024:
Carrying Value at September 30, 2025
Fair Value at September 30, 2025
Using Inputs Considered as:
(in thousands)Level 1Level 2Level 3
Unsecured senior notes:
2027 Notes$347,675 $— $352,261 $— 
2029 Notes346,602 — 348,688 — 
2031 Notes546,336 — 486,343 — 
2034 Notes543,197 — 538,417 — 
Unsecured term loan credit agreement:
2027 Term Loan199,020 — 201,292 — 
Secured term loan credit agreements:
2023 Oman Facility1
35,465 — — 35,465 
2024 Oman Facility1
38,789 — — 38,789 
Total long-term debt, net of current portion
$2,057,084 $— $1,927,001 $74,254 
(1)The secured term credit agreements are classified as nonpublic debt, meaning their value was directly negotiated between the involved parties and is not observable in the market. As a result, they are categorized as Level 3. Since this debt is nonpublic, the carrying value and the fair value of the loans are identical.
Carrying Value at September 30, 2024
Fair Value at September 30, 2024
Using Inputs Considered as:
(in thousands)
Level 1
Level 2
    
Level 3
Unsecured senior notes:
2027 Notes
$347,093 $— $350,700 $— 
2029 Notes346,297 — 345,100 — 
2031 Notes
545,738 — 471,350 — 
2034 Notes
543,054 — 535,700 — 
Total long-term debt
$1,782,182 $— $1,702,850 $—